Dishwashing machine



March 17, 1925. 1,529,770

- H. F. CAVANAUGH ET AL I DISHWASHING BACHiNE Filed 001;. 4. 1922 2Sheets-Sheetl March 17. 1925'. 1,529,170

- H. F. CAYANAUGH ET AL Y Y .DISHWASHING MACHINE Filed Oct. 4. 1922 2Sheets-Sheet 2' I amen-tors 2% do Lui i?! Cale/e7 v ZVZYQW 351 e machinein position when washing PutentedMar. 17, 1925.

UNITED STATES PATENT. omen.

HARRY I. CAVANAUGH AND THEODORE S. HALL, OI OAKLAND, AND EDWIN S. CUL-VER, OI PIEDIONT, CALIFORNIA, ASSIGNORS .10 SURGE! MANUFACTURING CO'M-PANY, OF EIEBYVILLE, CALIFORNIA, A CORPORATION OF CALIFORNIA.

msnwn'snmo imcnmn To all whom it may concern:

Be it known that we, HARRY F. CAVA- NAUGH and Tunononn S. HALL, residingat Oakland, county of Alameda, State of 5 California, and EDWIN S.CULvEn, residing at Piedmont, county of Alameda, State of Californimandcitizens of the United States,

have invented new and uwful Improvements in Dishwashing Machines, ofwhich the following is a specification.

This invention relates to a dish washing machine and epecially to amachine of the portable type.

I The object of the generally improve an simplify machines of thecharacter described; to provide a machine which is particularly adaptedfor use in hotels, restaurants and like places, where dishes must behandled rapidly and in large quantities, and where the dishes arerinsed, scalded and dried by themselves after washing; to rovide amachine which is portable to permit it to be quickly and readily movedfrom one tank to another, etc., and which may be placed in any suitablemanner in a tank or receptacle regardless of drain connections or theshape of the tank; to provide a machine which is motor-driven; v andfurther to provide novel-means for efficiently circulating water, andfor producing a flattened fan-like discharge whereby the water may becfiectivelydirected through the dishes and circulated through the tankin such a manner that an underflow and an overflow return current isproduced, the latter not only washing the dishes in the rear, but alsoskimming the surface of the wash water, thus removm'g scum, suds, fattymatter, etc., which would otherwise collect 'on the dishes whenwithdrawn. Other objects will hereinafter appear.

One form which our invention may assume is exemplified in. the followingdescription and illustrated in the accompanying drawings, in which- Fig.1 is Fig. 2 is a side elevation partly in section.

Fig. 3 is a cross section on line 3-3, Fig. 1. r v

4 is a sectional view of a tank show es Referring to the drawings indetail, and particularly to F gs, 1, 2 and 3, A indicates resentinvention is to a front view of the machine.

in general a casting, which consists of a base section B, anintermediate section C, and an upper section D. These sections areformed integral with relation to each other as they are produced in asin le casting and they serve two functions: that of -a support for anelectric motor ofsuitable construction, such as indicated at 2, andsecondly that of a journal member and support for a shaft 3 and animpeller 4, which is secured thereon. Therelectric motor may be securedon the upper end of the housing in any suitable manner and it ispreferably enclosed when in position by means of an exterior cap 5,whlch is secured by means of screws or the like, as indicated at 6,thereby forniing a substantially water-tight joint between the castingand the cap. The intermediate portion G is cored out toform a watercirculating chamber 7. The shaft 3.

extends vertically through this chamber and is positioned substantiallycentrally therewith. The upper end of the chamber is curved and directedforwardly as indicated at 8, and it terminates in a nozzle 9, which iselongated and substantially rectangular in shape. (See particularly Fig.1). That is the upperend of the circulating chamber 7 terminates in anozzle opening 10, which has the rectangular shape referred to, and thisdischarge opening is deflected .in a downward direction ,as. indicatedby the arrow 11 t0 direct the water into and between the dishes disposedin a basket indicated at 12. The lower end of .the water circulatingchamber terminates in the base portion B, which is provided with aseries of radially disposed openings 13 through which, the inlet wateris admitted when the machine is in operation. These numerous openingspro- 0 vide a liberal area for the incoming water and iltl thusdenterswith] th; least resistance possi e,sa1 openmgsa so orminga uligthtg,guard against the admission 0 dish c 0 etc.

The baseportion is rovided with a substantially flat face, as own at 14,a pair of inwardl curved side sections 15 and 16, and a s ort back orrearsection 17, which is parallel with the front section 14. Thisparticular arrangement of the front, side and rear sections is of someimportance as it often happens that tanks are equipped with waste pipesextending a cons: av

ate-.

tered in the rear ofthe smaller tanks with out interfering with theconnections or fittings referred to. I

The shaft 3 is coupled in any suitable manner'as indicated at 18 to themotor-shaft and it is held in its vertical position by means of a pairof bearings such as shown at 19 and 20. These bearings are preferably ofthe self-lubricating type as they remain in a submerged'condition' whenthe machine is in operation. A thrust collaiis also employed, as shownat 21, to relieve the motor of any thrust which the impeller 4 createswhen in operation. The main casting A is cored out above the circulatingchamber 7 to form a chamber 22. An opening 23 is formed in the rear sideof the casting to permit access to the chamber,

for instance to adjust or inspect the thrust downward collar and thecoupling 18 or otherwise. A removable hand plate 24 is, however,employed by which the chamber is normally closed and drain openings areformed in the lower part of the chamber or in the hand hgle plate tovpermit free escape of any water which may enter through the bearing 19.

In actual operation the machine is placed in one end of the tank asshown in Fig. 4. Water containing soap or other washing ingredients, isthen. admitted to the tank until the a proximate level indicated isobtained. wire basket containing the dishesto be washedxis then placedin the tank and in front of the discharge nozzle 9 in such a positionthat the discharging fan shaped stream of water will be effectivelydirected downward and through the basket and between the dishes. Thecurrent set up by the fan-shaped stream after passing and through thedishes is deflected along the bottom of the tank to the opposite end ofthe tank and then upwardly and back through the dishes and alon thesurface, one feature of this action eing that part of the return currentskims the surface of su'ds and refuse. This is of great importance assuch matter. would otherwise adhere tothe surface of the dishes when thebasket is removed.

The washing ofithe dishes only requiresa few seconds and it is thendesirable that they should be rinsed and vscaldecl. The

basket with the dishes is therefore placed in the scalding tank. Thewater is here mamtained at practically a boiling temperature and thedishes are therefore rapidly rinsed and sterilized and will dry bythemselves when basket is removed. a

' that the mechanism emplo The gigeral construction and design of themac e here illustrated are of considerable importance. First it shouldbe noted ed is extremely simple as only three working parts arerequired, to-wit, the motor, the shaft and the impeller carried thereby.Such simplicity of constructloneliminates the necessity of skilledoperators, etc., and should therefore.

give satisfactory service with comparatively little attention and care.The motor may be attached to any standard lighting circuit by anextension or plug shown and as the casting employed holds the motorconsiderably above-the water overflow line, it can be seen thatshort-circuiting, etc., will be avoided. The machine as a whole islight'in weight and is-provided with handles suchas shown and cantherefore be easily and readily grasped and movedfrom one tank toanother whenever desired. Theshapeof the base portion permits the lowerend to be entirel open and also serves as a liberal inlet to thecirculating chamber 7 as numerous openings 1'3 may be formed in thefront and sides thereof. The inward flare in the side sections 15 and 16is also important as it reduces the amount of floor or bottom spacerequired, particularly when drain fittings, etc., are encountered.

While certain features; lnventlon are more or less specifically illusofthe present trated, we wish it understood that various changes in formand proportion may be resorted to within'the scope of the appendedclaims, similarly that the materials and finish of the several partsemployed may be such as the experience and judgment of the manufacturermay dictate or various uses may demand, Having thus we claim and desireto secure by Patent is- Letters A dish washing machine of the characterdescribed ficomprising a vertically disposed casting, a base portionthereon, a water circulating chamber formed in the casting above thebase portion, a plurality of gratelike inlet openings formed in the baseportion and in communication with the lower end of the chamber, anelongated, downwardly directed, horizontally disposed, rectangularshaped discharge spout formed in the c'asting and in communication withthe upper end of the chamber, an electric motor on the upper end of thecasting, a housing enplosing the same, a vertically disposed shaftjournalled in the casting and extending into the water circulatingchamber, said shaft being directly connected with the motor, and animpeller secured on the shaft and also disposed in the water circulatinchamber.

RY F. OAVANAUGH. THEODORE ,S. HALL EDWIN S. r VER.

1 described our invention, what 7

